Fix typo in StoryboardBased examples

[danshevluk]

No description provided.

[AliSoftware]

Thanks for your contribution!

Could you add an entry in the CHANGELOG to credit yourself? Even documentation fixes however small they are are important 😉

(Don't forget to add a period and 2 spaces at the end of the line describing your change, it has to do with markdown formatting — just look at other entries for inspiration)

[danshevluk]

@AliSoftware Done! 🎉